chore(editorconfig): set and apply some defaults (#974)

.editorconfig

@@ -2,6 +2,12 @@
 
 root = true
 
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+
 [*.rs]
 indent_style = space
 indent_size = 4

.github/workflows/check-pr.yml

@@ -84,4 +84,3 @@ jobs:
           echo "Pull request is labeled as 'do not merge'"
           echo "This workflow fails so that the pull request cannot be merged"
           exit 1
-

CONTRIBUTING.md

@@ -113,6 +113,7 @@ exist to show coverage directly in your editor. E.g.:
 ### Documentation
 
 Here are some guidelines for writing documentation in Ratatui.
+
 Every public API **must** be documented.
 
 Keep in mind that Ratatui tends to attract beginner Rust users that may not be familiar with Rust
@@ -125,10 +126,9 @@ the concepts pointing to the various methods. Focus on interaction with various
 enough information that helps understand why you might want something.
 
 Examples should help users understand a particular usage, not test a feature. They should be as
-simple as possible.  
-Prefer hiding imports and using wildcards to keep things concise. Some imports may still be shown
-to demonstrate a particular non-obvious import (e.g. `Stylize` trait to use style methods).  
-Speaking of `Stylize`, you should use it over the more verbose style setters:
+simple as possible. Prefer hiding imports and using wildcards to keep things concise. Some imports
+may still be shown to demonstrate a particular non-obvious import (e.g. `Stylize` trait to use style
+methods). Speaking of `Stylize`, you should use it over the more verbose style setters:
 
 ```rust
 let style = Style::new().red().bold();

src/widgets/barchart.rs

@@ -189,7 +189,7 @@ impl<'a> BarChart<'a> {
     /// If not set, this defaults to `1`.
     /// The bar label also uses this value as its width.
     #[must_use = "method moves the value of self and returns the modified value"]
-    pub fn bar_width(mut self, width: u16) -> BarChart<'a> {
+    pub const fn bar_width(mut self, width: u16) -> BarChart<'a> {
         self.bar_width = width;
         self
     }